Hydrocarbons — JEE Main PYQs

A hydrocarbon ' X ' with formula $\mathrm{C}{}_6\mathrm{H}{}_8$ uses two moles of $\mathrm{H}{}_2$ on catalytic hydrogenation of its one mole. On ozonolysis, 'X' yields two moles of methane dicarbaldehyde. The hydrocarbon ' X ' is :

Choose the correct set of reagents for the following conversion
trans ($\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$) → cis ($\mathrm{Ph}-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$)

An organic compound 'A' with empirical formula ${\mathrm{C}}_6{\mathrm{H}}_6\mathrm{O}$ gives sooty flame on burning. Its reaction with bromine solution in low polarity solvent results in high yield of B. B is

Choose the correct option for the following reactions.

Identify the major product A and B for the below given reaction sequence.

Arrange the following in increasing order of reactivity towards nitration
A. p-xylene
B. bromobenzene
C. mesitylene
D. nitrobenzene
E. benzene

Choose the correct answer from the options given below

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Aniline on nitration yields ortho, meta & para nitro derivatives of aniline.

Reason R: Nitrating mixture is a strong acidic mixture.

In the light of the above stat …

A compound ' A ' on reaction with ' X ' and ' Y produces the same major product but different by product ' a ' and ' b '. Oxidation of ' a ' gives a substance produced by ants.

' X ' and ' Y ' respectively are :

Which of the following is not an example of benzenoid compound?

Total number of isomers (including stereoisomers) obtain on monochlorination of methylcyclohexane is ____.

Major product 'B' of the following reaction sequence is:

The total number of monobromo derivatives formed by the alkanes with molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{12}$ is (excluding stereo isomers) ____

Ċl + CH₄ → A + B

A and B in the above atmospheric reaction step are

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Experimental reaction of ${\mathrm{CH}}_3\mathrm{Cl}$ with aniline and anhydrous ${\mathrm{AlCl}}_3$ does not give o and p-methylaniline.

Reason (R) : The …

In the presence of sunlight, benzene reacts with ${\mathrm{Cl}}_2$ to give product, X. The number of hydrogens in X is ______.

The major product of the following reaction contains ______ bromine atom(s).

What will be the major product of following sequence of reactions?

Product 'A' of following sequence of reactions is
Ethylbenzene (Major product)

The major product (P) in the reaction

(see reaction scheme)

[Ph is $-\mathrm{C}{}_6\mathrm{H}{}_5$] is

The stable carbocation formed in the above reaction is :

In Friedel-Crafts alkylation of aniline, one gets :

Halogenation of which one of the following will yield m-substituted product with respect to methyl group as a major product?

Two isomers 'A' and 'B' with molecular formula ${\mathrm{C}}_4{\mathrm{H}}_8$ give different products on oxidation with ${\mathrm{KMnO}}_4$ in acidic medium. Isomer 'A' on reaction with ${\mathrm{KMnO}}_4/{\mathrm{H}}^{+}$ results in effervescence of a gas and gives ketone. The com …

'$\mathbf{A}$' and '$\mathbf{B}$' respectively are:
…

Which among the following pairs of the structures will give different products on ozonolysis? (Consider the double bonds in the structures are rigid and not delocalized.)

In the given reactions sequence, the major product 'C' is:

Which of the following reagents/ reactions will convert 'A' to 'B'?

The products formed in the following reaction.

Number of grams of bromine that will completely react with 5.0 g of pent-1-ene is $\_\_\_\_$ × $10^{-2}\mathrm{g}$. (Atomic mass of $\mathrm{Br}=80\mathrm{g}/\mathrm{mol}$ ) [Nearest Integer)

In the following reaction the reason why meta-nitro product also formed is:

What is the major product formed by HI on reaction with



?

Which of the following reagent is used for the following reaction ?

The correct options for the products A and B of the following reactions are

The correct sequential addition of reagents in the preparation of 3-nitrobenzoic acid from benzene is:

Excess of isobutane on reaction with $\mathrm{Br}{}_2$ in presence of light at $125^{\circ }\mathrm{C}$ gives which one of the following, as the major product?

Which one of the following carbonyl compound cannot be prepared by addition of water on an alkyne in the presence of ${\mathrm{HgSO}}_4$ and ${\mathrm{H}}_2{\mathrm{SO}}_4$ ?

Benzene on nitration gives nitrobenzene in presence of ${\mathrm{HNO}}_3$ and ${\mathrm{H}}_2{\mathrm{SO}}_4$ mixture, where:

Metallic sodium does not react normally with:

Identify $A$ in the given chemical reaction.
${\mathrm{H}}_2{\mathrm{C}}^{/{\mathrm{CH}}_3}$
$\underset{{\mathrm{CH}}_2}{\overset{\mathrm{HC}}{\to }}{}_{{\mathrm{CH}}_3}^{\mathrm{CH}}$
'A'
major product

Consider the following chemical reaction.

The number of ${\mathrm{sp}}^2$ hybridized carbon atom(s) present in the product is _____

Which one of the following reactions does not occur?

Identify correct A, B and C in the reaction sequence given below :

The structures of A and B formed in the following reaction are : [Ph = -C₆H₅]

(see structure)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Treatment of bromine water with propene yields 1-bromopropan-2-ol.
Reason (R): Attack of water on bromonium ion follows Markovnikov rule and results in 1-bro …

Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction:
${\mathrm{CH}}_4+{\mathrm{I}}_2\underset{\text{Reversible}}{\stackrel{h\nu }{\rightleftharpoons }}{\mathrm{CH}}_3\mathrm{I}+\mathrm{HI}$

Product "A" in the above chemical reaction is:

In the above reaction, 3.9 g of benzene on nitration gives 4.92 g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is ______ %
(Round off to the nearest integer).
(Given atomic mass : C: 12.0u, H:1.0u, O:16.0u, N:14.0u)

The given reaction can occur in the presence of:
(a) Bromine water
(b) ${\mathrm{Br}}_2$ in ${\mathrm{CS}}_2,273\mathrm{K}$
(c) ${\mathrm{Br}}_2/{\mathrm{FeBr}}_3$
(d) ${\mathrm{Br}}_2$ in ${\mathrm{CHCl}}_3,273\mathrm{K}$
Choose the correct answer from the opti …

An organic compound 'A' ${\mathrm{C}}_4{\mathrm{H}}_8$ on treatment with ${\mathrm{KMnO}}_4/{\mathrm{H}}^{+}$ yields compound 'B' ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$. Compound 'A' also yields compound 'B' on ozonolysis. Compound 'A' is:

The stereoisomers that are formed by electrophilic addition of bromine to trans-but-2-ene is/are